Yup, I can remember several companies settling and being forced to comply for violations of busybox GPL'd code in the US off the top of my head - Verizon, Extre

Yup, I can remember several companies settling and being forced to comply for violations of busybox GPL'd code in the US off the top of my head - Verizon, Extreme Networks and Xterasys. There are likely quite a few other examples of GPL being successfully enforced.